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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e7d23ef5a27a82e0628052b4ba925e90393cdee974f16b11364eccc116d7dfc' 
  AND token = 'Z5TaKr727YaPecU8z+GfHYurXInRHRGeHcJALCiiNiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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