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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eca45ddf0b3e0fb7d14af79c3bf2220978373583eca8e8a3534b848c260e7346' 
  AND token = 'l+cmG4OpC85GlF1Q4w69EM5A4Di1z5c0SbSShoHCfrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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