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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb88b6d91804f28faf4e3d465289f7251846d1924dd7eeff550dfd541f8f4d6e' 
  AND token = 'f/Ha7wikRHozi2v0AOPKekFLecjMEkmDnOIvAvQwQ6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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