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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afb701b6e4875ca4c49d4657b491894f4e0a9d5421e6c6fd2538433835305505' 
  AND token = 'Im8StP/6fAD6Jl/z2WOqzVstufa9CKEIHaTn4JqyyQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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