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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bc1c49cff79fa5856e469cf5644fe60043fe6b1e0c01c05962776975517be33' 
  AND token = 'oTV6CprCYTaBTXGVhhiCyTauzITkKoJ0fNgjxv1kCIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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