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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '349e285329e480cf5de2c3901fdc604c3b28bcf0b26bdb3aea7ecc15eddc4eb3' 
  AND token = 'oEFXeo4/NU+I4lzC+vwtm94F6hhbIhnfi76n+8VO3tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}