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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '081bae51d64362bcd269ce2e6be486b3afe88a32a688cb6168f0a20d1c3e06d6' 
  AND token = '5mQsivFEHug68slIsu2k67kROvnQNI5/v2dJh64OQU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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