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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2626d516d3a6067123ac1e2febc01734e49da4795dc00e786a20a2d1e218e195' 
  AND token = 'nL1UqqPVvxZzcahRkYkthMO5tyHR2NT6T6gcYdY9VeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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